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Old 06-05-2011, 10:13 AM
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Photo of inside of a cast GM MC?

I have a cast GM style master cylinder with 1 1/8" bore. One of the reservoars are smaller than the other. Does that mean it is for a disc/drum application? I would say the front reservoar take app 2/3 of the reservoar capacity.
the divider between the reservoars goes in the middle,and the cap has the usual two equal bumps, but the divider wall goes diagonal down to the bottom.

Or do the Disc /disc masters have a smaller rear reservoar too?

Does any of you have a photo of your Corvette/GM style master with the cap off? Then I could compare and find out what mine is intended for.

I have a disc/disc set up, and I suspect my master cylinder is for disc/drum.

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Old 06-05-2011, 10:52 AM
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The master you have is for disc drum.The reason for a different size reservoir is that the rear has a self adjuster to keep the wheel cylinder travel to a minimum, requiring only a small amount of fluid.
In the disc setup the fluid is what accomplishes the adjustment for pad wear, as fluid takes up the space in the caliper as the pad wears and the piston moves outward from the caliper bore.
The minimum and maximum level marks on a master With a plastic reservoir is not to indicate fluid level requirement for the reservoir but to indicate how much pad is left ,as pad wear depletes the fluid level, but only as a presumptive for a brake inspection, as a lot of lube technicians think filling the master at a service is what the marks are for.
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